JP5720891B2 - Stator and manufacturing method thereof - Google Patents

Description

  The present invention relates to a stator used in a radial gap type rotating electrical machine and a method for manufacturing the same.

  A radial gap type rotating electrical machine is a rotating electrical machine that includes a rotor that is arranged to be rotatable about a rotation axis, and a stator that is arranged with a gap in the radial direction of the rotor. The stator has a plurality of teeth protruding radially from the inner periphery of the annular yoke, a stator core provided with slots between adjacent teeth in the circumferential direction, a PET (polyethylene terephthalate) film in each slot, etc. And a winding arranged via an insulator.

  When this radial gap type rotating electrical machine is used in, for example, a rotary compressor for refrigerant used in an air conditioner, the rotating electrical machine is accommodated in a cylindrical container (for example, a pipe). At this time, the stator is fixed inside the container, but welding is performed as the fixing means. If the heat generated during welding is transferred to the insulator through the stator core, the insulation between the stator core and the windings is destroyed, and there is a risk of causing a discharge or a short circuit. Techniques for avoiding this are disclosed in the following patent documents.

  For example, a stator in which a gap is provided between a welded portion and a slot is known (see, for example, Patent Document 1). According to such a stator, air in the air gap becomes a thermal resistance, and there is an advantage that the influence of heat generated during welding on the insulator disposed in the slot can be reduced. However, there is room for improvement because there is also heat transferred from the weld to the slot avoiding this gap.

  As one of the improvement measures, a stator is known in which an opening is provided at one end in the circumferential direction of the air gap (see, for example, Patent Document 2). According to such a stator, a portion of the heat transfer path is blocked by providing the opening, and the heat transferred from the welded portion to the slot can be further reduced. However, the provision of the opening may result in insufficient mechanical strength at the portion where the weld is provided.

JP 2010-236421 A JP 2011-55576 A

  The present invention has been made in view of such circumstances, and a stator capable of reducing the influence of heat at the time of welding and ensuring the mechanical strength of a portion where a weld is provided, and a method for manufacturing the same. It is intended to provide.

  The present invention relates to a stator for a rotating electrical machine housed in a cylindrical container, which is formed by laminating a plurality of core sheets formed of electromagnetic steel sheets in a predetermined shape in the direction of the rotation axis, and having an annular yoke, A gap formed between an inner periphery and an outer periphery of the yoke, and a through hole provided in a portion constituting the yoke of the core sheet communicating in the direction of the rotation axis across the core sheet; A welding portion that is provided on an outer periphery of the yoke located outside the gap portion and fixes the container and the stator core, and in the gap portion facing the weld portion, the penetration in the circumferential direction of the yoke Openings are provided on one end side or the other end side of the hole, and the openings are alternately arranged on one end side or the other end side of the through hole for each of the one or more core sheets. Features To.

  The stator according to the present invention is characterized in that the core sheet includes crimps on both sides of the through hole in the circumferential direction of the yoke.

  The stator according to the present invention is characterized in that the core sheet includes a crimp on the outside of the through hole in the radial direction of the yoke.

  The stator according to the present invention is characterized in that the through-hole communicates with all the laminated core sheets, and the gap is used as a fluid flow path serving as a heat medium.

  The present invention also relates to a method of manufacturing a stator for a rotating electrical machine housed in a cylindrical container, the step of preparing an electromagnetic steel sheet, and a yoke part having an arcuate outer periphery by punching the electromagnetic steel sheet. Forming a peripheral edge of the core sheet including a predetermined shape, and forming a through hole between the outer periphery and the inner periphery of the yoke part, and if necessary, one end side of the through hole in the circumferential direction of the yoke part or A core sheet punching process in which an opening is formed on the other end side, and each core sheet obtained by the punching process are stacked in the rotation axis direction, and the through hole extends in the rotation axis direction across the plurality of core sheets. In addition to forming a communicating cavity, the openings are alternately arranged at one end side or the other end side of the through hole in the circumferential direction of the yoke section for each of the one or more core sheets. Yes, core In order to fix the stator core obtained by the stator core forming step and the container, welding is performed on the outer periphery of the stator core located outside the gap portion. And a welding process.

  In the stator manufacturing method of the present invention, in the punching step, the plurality of through holes are formed in one core sheet, and one end of the through hole in the circumferential direction of the yoke portion is formed in one through hole. The opening is formed on the side, and the opening is formed in the other through hole on the other end side of the through hole in the circumferential direction of the yoke.

  In the stator manufacturing method of the present invention, in the laminating step, the core sheet having the same shape punched and formed in the punching step is rotated relative to the already laminated core sheet by a predetermined angle in the circumferential direction. It is characterized by being laminated.

  According to the stator of the present invention, since the gap is provided at a position facing the welded portion, the air in the gap becomes a thermal resistance, and the heat generated during welding is given to the insulator arranged in the slot. Impact is reduced. In the through hole of the core sheet constituting the gap portion, an opening is provided on one end side or the other end side in the circumferential direction of the yoke. Therefore, a part of the heat transfer path is blocked by the opening, and each core The effect of reducing the heat transferred from the welded part to the slot in the sheet can be further enhanced. Moreover, since this opening part is alternately arrange | positioned at the one end side or other end side of a through-hole for every 1 or several core sheet | seat, the force concerning the part in which a welding part is provided is given to the both sides of the circumferential direction of a space | gap part Can be received in one. For this reason, it is possible to sufficiently secure the mechanical strength of the portion where the welded portion is provided. At the same time, since the heat transfer direction is also distributed on both sides in the circumferential direction of the gap, it is possible to obtain a synergistic effect that can prevent the occurrence of bias in the deterioration of magnetic characteristics due to welding.

  In the present invention, if caulking is provided on both sides of the through hole in the circumferential direction of the yoke, the strength in the vicinity of the gap between the core sheets laminated with the openings alternately arranged on one end side or the other end side of the through hole Can be increased. Specifically, by providing caulking, the laminated core sheets are not easily separated from each other, and core sheets having different arrangements of openings in the circumferential direction can be handled as an integral unit in terms of strength. Further, each core sheet can be caulked at a portion where the magnetic flux density is relatively low. For this reason, it is possible to increase the mechanical strength of the yoke and the mechanical strength of the stator core itself in the portion where the weld is provided without obstructing the magnetic path through which the magnetic flux flows.

  In the present invention, if a caulking is provided outside the through hole in the radial direction of the yoke, a welded portion is provided in the portion where the caulking is provided, so that deterioration of magnetic characteristics due to these can be minimized. . Thereby, deterioration of the magnetic characteristics of the entire stator core can be effectively reduced. Further, the mechanical strength of the portion where the welded portion is provided can be further increased, and the mechanical strength of the stator core itself can be increased at the same time.

  In the present invention, if the through holes are communicated over all the laminated core sheets and the gap is used as a fluid flow path as a heat medium, heat generation of the stator can be effectively suppressed. As a result, the capacity of the rotating electrical machine can be increased, and the performance of the compressor can be improved.

  Further, according to the stator manufacturing method of the present invention, by adopting the above-described stator core forming step and welding step, the influence of heat during welding is reduced, and the yoke mechanically in the portion where the welded portion is provided. A stator having a sufficient strength can be manufactured. This makes it possible to fix the stator in a cylindrical container such as a pipe without destroying the insulation between the stator core and the windings and minimizing the deterioration of the magnetic properties of the stator core. Become.

  In the punching step, a plurality of through holes are formed in one core sheet, an opening is formed in one through hole on one end side, and the other through hole is formed on the other end side. If it is configured to form the opening, the number of steps in the stator core forming step can be greatly reduced. Specifically, by adopting an integrated core sheet in which through holes are formed at predetermined positions, each core sheet laminated in the rotation axis direction through the punching process and the laminating process is integrated as a stator core. The process is greatly simplified. The integral stator core has an advantage that the magnetic resistance can be reduced because the split portion is not formed in the yoke serving as a magnetic path.

  Furthermore, in the laminating step, if the core sheet having the same shape punched and formed in the punching step is configured to be rotated by a predetermined angle in the circumferential direction relative to the already laminated core sheet, The punching process of the core sheet can be greatly simplified. That is, in the punching process, it is only necessary to form a core sheet having the same shape, so that the processes such as mold positioning and mold selection can be omitted or simplified. Moreover, since the number of the metal molds to be used can be reduced, the equipment cost can be reduced.

It is a plane sectional view which met an II line (Drawing 2) showing a rotary electric machine provided with a stator concerning a first embodiment. It is a longitudinal cross-sectional view along the II-II line (FIG. 1) which shows the rotary electric machine provided with the stator which concerns on 1st embodiment. It is a perspective view showing a core sheet concerning a first embodiment. It is a schematic diagram which shows each lamination surface formed in a part of outer periphery of the stator which concerns on 1st embodiment. It is a schematic diagram which shows the modification of each lamination surface formed in the outer periphery of the stator which concerns on 1st embodiment. It is a perspective view which shows the laminated body which concerns on 1st embodiment. It is the elements on larger scale which show the core sheet which concerns on 2nd embodiment. It is a top view which shows the stator and core sheet which concern on 3rd embodiment. It is a schematic diagram which shows each lamination surface formed in a part of outer periphery of the stator which concerns on 3rd embodiment. It is a top view which shows the stator which concerns on 4th embodiment. It is a perspective view which shows the core sheet which concerns on 4th embodiment. It is a schematic diagram which shows each lamination surface formed in the outer peripheral surface of the stator which concerns on 4th embodiment, and its modification. It is a perspective view which shows the laminated body which concerns on 4th embodiment. It is a top view which shows the modification of the core sheet which concerns on 1st embodiment. It is a top view which shows the other modification of the core sheet which concerns on 1st embodiment. It is a top view which shows the modification of the shape of the through-hole formed in the core sheet which concerns on each embodiment.

  Hereinafter, embodiments of a stator according to the present invention will be described with reference to the drawings. In this specification, when it shows with the same code | symbol, it shall show the same structure. Further, in each drawing, hatching indicating a cross section is omitted as appropriate in order to clearly indicate a symbol and a leader line indicating each component.

  As shown in FIG.1 and FIG.2, the stator 10 which concerns on 1st embodiment comprises the radial gap type rotary electric machine 100 accommodated in cylindrical container P (for example, pipe etc.), The rotor 2 is disposed so as to be rotatable about the axis O of the rotating shaft 1 and is disposed with a gap in the radial direction. The stator 10 according to the present embodiment includes a stator core 11, a gap portion 12 provided in the stator core 11, and a welding portion 13 for fixing the stator core 11 to the container P.

  The stator core 11 includes an annular yoke 111 and a plurality of teeth 112 projecting radially from the inner periphery of the yoke 111. Slots 113 are provided between teeth 112 adjacent in the circumferential direction. In each slot 113, a winding 115 is disposed via a film-like insulator 114 having electrical insulation (illustration in all slots 113 is omitted). The number of teeth 112 and slots 113 can be appropriately changed according to, for example, the number of magnetic poles of the rotor 2 and the application of the rotating electrical machine 100, and it is not questioned whether the number is even or odd. In the present embodiment, six teeth 112a to 112f are arranged at equal intervals in the circumferential direction, and slots 113 are also provided at six locations.

The stator core 11 is formed by laminating a large number of core sheets S ₁ (see FIG. 3) having a predetermined shape made of an electromagnetic steel sheet having a thickness of about 0.3 to 0.5 mm, whose surface is insulated, It is formed by integrating these. There is no particular limitation on the stacked core sheet S ₁ is the lamination thickness (number), for example, can be appropriately designed depending on, for example, the height and size of the rotation axis direction of the container P of the opposing rotor 2. As a method for integrating each core sheet S ₁ which are stacked, for example, welding, caulking, resin mold, and a method such as varnish impregnation. You may perform combining these methods suitably.

The stator core 11 is formed by laminating a predetermined number of core sheets S ₁ integrally formed with an annular yoke portion Y and a plurality of teeth portions T protruding radially from the inner periphery of the yoke portion Y. This is a so-called integrated stator core. Therefore, the yoke 111 and the teeth 112 of the stator core 11 is composed of a yoke section Y and the teeth T of each core sheet S ₁ that are stacked. Incidentally, the stator core 11 does not have to be constituted by only the core sheet S ₁ shown in FIG. For example, other core sheets (not shown) having the same planar shape as the core sheet S ₁ (that is, the planar shapes of the yoke portion Y and the teeth portion T are the same) may be included.

In the stator core 11, a curved surface portion (planar arc portion) and a planar portion (planar straight portion) are formed on the outer periphery of the yoke 111 (see FIG. 1). In the present embodiment, generally, a curved surface portion is formed on the outside of each of the teeth 112a to 112f, and a flat surface portion is formed on the outside of each slot 113, and a part of this curved surface portion is placed on the container via a welded portion 13 described later. It is fixed to the inner surface of P. Further, as shown in FIG. 4, laminated surfaces A _{1 to} A ₆ formed by laminating the outer circumferences of the plurality of core sheets S ₁ are formed on each curved surface portion on the outer circumference of the yoke 111.

In FIG. 4, but illustrates the respective lamination surfaces A ₁ to A ₆ formed by the outer periphery of the core sheet S ₁ of the twelve (first layer to 12 layers), each laminate illustrated in FIG. 4 The surfaces A _{1 to} A ₆ indicate a partial region in the rotation axis direction on the outer periphery of the yoke 111, and the form thereof is, for example, when the stator core 11 includes another core sheet, the product of the core sheet S ₁ . It differs depending on the thickness (number of sheets) or the arrangement of the gaps 12 described later. The same applies to laminated surfaces B _{1 to} B ₆ , laminated surfaces C _{1 to} C ₆ , and laminated surface D described later.

The gap portion 12 is a space provided between the inner periphery and the outer periphery of the yoke 111. As shown in FIG. 3, the core sheet S ₁ constituting a part of the stator core 11 has one end and the other end in the circumferential direction of the yoke portion Y, and is a plan view penetrating from one surface of the yoke portion Y to the other surface. Two triangular through holes H are provided at positions shifted by 180 degrees in the circumferential direction of the yoke portion Y. In the present embodiment, the voids 12 are formed by laminating the core sheets S ₁ so that the through holes H communicate with each other in the rotation axis direction across the plurality of core sheets S ₁ . Therefore, in this embodiment, the space | gap part 12 which comprises a substantially triangular prism-shaped space is provided in two places in the position shifted | deviated 180 degree | times to the circumferential direction. The number of the gap portions 12 is not particularly limited, and is appropriately selected according to, for example, the number of poles of the stator core 11 or the number of weld portions 13 described later.

The gaps 12 are preferably arranged in a balanced manner in the circumferential direction of the yoke 111 or in the direction of the rotation axis. In the present embodiment, the gap 12, as shown in FIG. 4, the laminated surfaces A ₁ to A rotational axis direction of a region X ₁ in ₆ (first to fourth layers), the lamination plane A _3, A ₆ In the region X ₂ (5th to 8th layers), on the inside of the laminated surfaces A ₂ and A ₅ , and in the region X ₃ (9th to 12th layers) on the inside of the laminated surfaces A ₁ and A ₄ Respectively. That is, the circumferential phase of the gap 12 provided in a certain region is relative to the circumferential direction relative to the circumferential phase of the other gap 12 provided in another region adjacent to the rotation axis direction. It is arranged at a position shifted by 60 degrees. By disposing the gap 12 in this way, it is possible to prevent the mechanical strength of the stator core 11 from being biased.

In the present embodiment, the gap portion 12 does not necessarily have to be formed in all the regions (including the regions X _{1 to} X ₃ ) in the rotation axis direction on the respective stacked surfaces A _{1 to} A ₆ . For example, another region in which the gap 12 is not provided may exist between the region X ₁ and the region X ₂ or between the region X ₂ and the region X ₃ in FIG. In other words, a predetermined number of other core sheets that are not provided with the through holes H may be included between the region X ₁ and the region X ₂ or between the region X ₂ and the region X ₃ . In this case, the circumferential phase of the gap 12 provided in a certain area is different from that of the other gap 12 provided in another area adjacent to the rotation axis direction across the area where the gap 12 is not provided. With respect to the phase in the circumferential direction, it is disposed at a position that is relatively shifted by 60 degrees in the circumferential direction.

The gap 12 is preferably formed in the yoke 111 at a position where the magnetic flux density is relatively low and there is a margin in the magnetic path width. This is to prevent the air gap 12 from becoming a magnetic resistance and obstructing the magnetic path. For example, as in the core sheet S ₁ of the present embodiment, a through hole H is provided on the outer side (circular arc in plan view) of the yoke part Y substantially outside the tooth portion T, and the through hole H has a triangular shape in plan view. In other words (in other words, the gap 12 is formed in a substantially triangular prism shape), it is desirable in that the magnetic path width can be kept constant. The same applies to the size and shape of the gap 12. In other words, the size and shape of the gap 12 are not particularly limited, and can be appropriately changed within a range that does not obstruct the magnetic path and within a range in which the mechanical strength of the stator core 11 can be secured.

The welded portion 13 is for fixing the stator 10 to the container P. Specifically, the outer periphery of the yoke 111 of the stator core 11 (more specifically, a part of each of the laminated surfaces A _{1 to} A ₆ ) is fixed to the inner surface of the container P via the welded portion 13. In the present embodiment, the welded portion 13 is provided on the outer periphery of the yoke 111 located on the outer side in the radial direction from the gap portion 12. More specifically, as shown in FIG. 4, the welded portion 13 is always provided at a position opposed to the gap portion 12 in the radial direction and within a height range of the gap portion 12 in the rotation axis direction.

The welded portion 13 is formed through a weld hole W that penetrates from the outer surface to the inner surface of the container P. Specifically, a welding hole W is provided in a portion of the container P facing the gap portion 12 in the radial direction, and a welding rod (not shown) is inserted into the welding hole W. Welding rod and the core sheet S ₁ is welded portion 13 is formed by melting part. Examples of the method for forming the welded portion 13 include arc welding and TIG welding. Further, since the weld hole W is completely filled with the welded portion 13, the hermeticity of the container P is ensured.

The welded portions 13 are preferably arranged in a well-balanced manner in the circumferential direction of the yoke 111 or in the direction of the rotation axis, like the gap portion 12. In this embodiment, the welding unit 13, as shown in FIG. 4, the laminated surfaces A ₁ to A rotational axis direction of a region X ₁ in ₆ (first to fourth layers), the lamination plane A _3, A ₆ In the region X ₂ (fifth to eighth layers), the layers are arranged on the laminated surfaces A ₂ and A ₅ , and in the region X ₃ (the ninth to twelfth layers), the layers are arranged on the laminated surfaces A ₁ and A ₄ . . That is, the circumferential phase of the welded portion 13 provided in a certain region is relative to the circumferential direction with respect to the circumferential phase of another welded portion 13 provided in another region adjacent to the rotation axis direction. It is arranged at a position shifted by 60 degrees. By disposing the welded portion 13 in this way, it is possible to prevent the fixing strength between the stator core 11 and the container P from being biased, and the magnetic characteristics of the stator core 11 due to the influence of heat generated when the welded portion 13 is formed. The influence of deterioration can be dispersed.

In the present embodiment, the weld 13 is not necessarily formed in all the region of the rotational axis direction at each lamination plane A ₁ to A ₆ (including the area X ₁ ~X _3). For example, there may be another region where the welded portion 13 is not provided between the region X ₁ and the region X ₂ or between the region X ₂ and the region X ₃ in FIG. That is, there is no limitation in particular about the number of the welding parts 13, What is necessary is just to adjust suitably as needed. This is because the fixed strength required between the stator 10 and the container P varies depending on, for example, the size and application of the rotating electrical machine 100.

The main characteristic points of the stator 10 of the present embodiment are as follows. That is, at least in the gap portion 12 facing the welded portion 13, an opening portion 14 is provided on one end side or the other end side of the through hole H in the circumferential direction of the yoke 111, and the opening portion 14 includes one or more openings. Each core sheet S ₁ is alternately arranged on one end side or the other end side of the through-hole H. This will be described in detail below.

As shown in FIG. 3, the opening 14 is a gap that communicates with the through hole H from the outer periphery of the yoke portion Y of the core sheet S ₁ . A part of the through hole H is opened in the radial direction by the opening 14, and a part of the yoke part Y located outside the through hole H is separated in the circumferential direction. The opening 14 serves as a thermal resistance for interrupting a heat transfer path of heat generated during welding. In the present embodiment, in the core sheet S ₁ , one (front side) through hole H has one end side of the through hole H in the circumferential direction of the yoke 111 (yoke part Y) (left side toward the outer periphery of the yoke part Y). ) And the other (back side) through hole H has an opening on the other end side of the through hole H in the circumferential direction of the yoke 111 (on the right side toward the outer periphery of the yoke part Y). 14 is provided.

  The width dimension in the circumferential direction of the opening 14 is not particularly limited, but may be a minute width as long as a part of the yoke portion Y located outside the through hole H is spaced apart in the circumferential direction. This is because air having a significantly lower thermal conductivity than the electromagnetic steel sheet serves as a heat medium in the opening 14. Moreover, the opening part 14 does not necessarily need to be formed with a uniform width in the radial direction. For example, the circumferential width of the opening 14 may be widened from the outer periphery of the yoke portion Y toward the through hole H, and conversely, the width is increased from the through hole H toward the outer periphery of the yoke portion Y. May be.

In this embodiment, the openings 14 in each lamination plane A ₁ to A _6, are arranged as follows. As shown in FIG. 4, in the laminated surfaces A ₁ and A ₄ , the opening 14 is disposed in the region X ₃ (the ninth layer to the twelfth layer). Among these, in the ninth layer and the eleventh layer in the laminated surface A ₁ and in the tenth layer and the twelfth layer in the laminated surface A ₄ , the laminated surface A ₁ is disposed on one end side of the through hole H in the circumferential direction of the yoke portion Y. In the tenth layer and the twelfth layer, and in the ninth layer and the eleventh layer in the laminated surface A ₄ , an opening 14 is disposed on the other end side of the through hole H in the circumferential direction of the yoke portion Y. .

In the stacked surfaces A ₂ and A ₅ , the opening 14 is disposed in the region X ₂ (fifth to eighth layers). Among these, in the fifth layer and the seventh layer in the laminated surface A ₂ and in the sixth layer and the eighth layer in the laminated surface A ₅ , the laminated surface A ₂ is disposed on one end side of the through hole H in the circumferential direction of the yoke portion Y. In the sixth layer and the eighth layer in FIG. 5 and in the fifth layer and the seventh layer in the laminated surface A ₅ , the opening 14 is disposed on the other end side of the through hole H in the circumferential direction of the yoke portion Y. .

In the stacked surfaces A ₃ and A ₆ , the opening 14 is disposed in the region X ₁ (first to fourth layers). Among these, in the first layer and the third layer in the laminated surface A ₃ and in the second layer and the fourth layer in the laminated surface A ₆ , the laminated surface A ₃ is disposed on one end side of the through hole H in the circumferential direction of the yoke portion Y. In the second layer and the fourth layer, and in the first layer and the third layer in the laminated surface A ₆ , an opening 14 is disposed on the other end side of the through hole H in the circumferential direction of the yoke portion Y. .

Thus, in the present embodiment, the core sheet S openings 14 provided in the through hole H of _1, in the welding portion 13 facing the gap portion 12, each one of the core sheet S _1, the through hole H Are alternately arranged on one end side or the other end side (that is, alternately on the left and right sides toward the outer periphery of the yoke portion Y). The openings 14 may be alternately arranged on one end side or the other end side of the through hole H for each of the plurality of core sheets S ₁ in the gap portion 12 facing the welded portion 13. For example, it may be every two core sheets S _{1 or} every three or more core sheets S ₁ as in the arrangement of the openings 14 in each of the laminated surfaces B _{1 to} B ₆ shown in FIG. Also good. Or you may arrange | position the opening part 14 by mixing the part for every sheet, and the part for every several sheets, respectively.

  Next, in the stator 10 of the present embodiment, the operation / function and the effect obtained by arranging the opening 14 as described above will be described.

As described above, the stator 10 of the present embodiment constitutes the radial gap type rotating electrical machine 100 housed in a cylindrical container P such as a pipe, and the stator 10 is fixed to the container P by welding. . If the heat generated during welding is transmitted to the insulator 114 through the stator core 11, the insulation between the stator core 11 and the winding 115 is broken, and there is a possibility that a discharge or a short circuit may occur. In the present embodiment, the plurality of welds 13 are provided locally on the outer periphery of the yoke 111 (more specifically, each of the stacked surfaces A _{1 to} A ₆ ). Therefore, the heat generated when forming each welded portion 13 is locally transmitted from each welded portion 13 to the yoke 111.

Here, even when the welded portion 13 is formed over a plurality of core sheets S ₁ (see FIGS. 4 and 5) as in this embodiment, the yoke 111 (the yoke portion Y of each core sheet S ₁ ). ) Is not transmitted from one core sheet S ₁ to the other core sheet S ₁ adjacent in the rotation axis direction, but takes the core sheet S ₁ as a heat transfer path and gives priority to the range. Move on. In other words, the laminated core sheets S ₁ serve as independent heat transfer paths. Between lamination of each core sheet S ₁ constituting the stator core 11 is interposed an insulating film and a small gap (not shown), because they become thermal resistance.

In the present embodiment, the welded portion 13 is provided on the outer periphery of the yoke 111 that is located on the outer side in the radial direction from the gap portion 12. At this time, the heat transferred to the yoke 111 moves around the gap portion 12. To do. More specifically, heat is transferred in the circumferential direction along the portion weld 13 of each core sheet S ₁ is formed on the outer periphery of the yoke portion Y. This is because air becomes thermal resistance in the gap portion 12 (through hole H). However, in the present embodiment, since the opening 14 in one of the moving direction of the heat is disposed, is cut off transfer of heat in the opening 14, the welding portion 13 of each core sheet S ₁ is formed The direction of heat transfer from the portion to be heated is limited. Therefore, in each core sheet S _{1 serving} as a heat transfer path, heat transferred from the welded portion 13 to the slot 113 is effectively reduced.

On the other hand, by providing the opening 14, the tongue-shaped steel plate is formed in the portion where the welded portion 13 of each core sheet S ₁ is provided (that is, the yoke portion Y positioned on the outer side in the radial direction from the through hole H). A piece (hereinafter referred to as a tongue piece portion) is in a cantilevered state on the side where the opening 14 is not provided. For this reason, there exists a possibility that the mechanical strength of the said yoke part Y in which the welding part 13 is provided may become inadequate. However, in the present embodiment, since the openings 14 are arranged alternately on one side or the other end of the one or more core sheets S ₁ each in the through hole H, the tip portion of the tongue piece portion is rotated It is held by the other core sheet S ₁ of the yoke portion Y which is adjacent in the axial direction. As a result, the tongue piece portion is supported on both sides in the circumferential direction, and the mechanical strength of the entire portion where the welded portion 13 of the yoke 111 is provided is sufficiently ensured.

  Thus, according to the stator 10 of the present embodiment, the opening 14 is provided on one end side or the other end side of the through hole H in the circumferential direction of the yoke 111 (yoke portion Y). By arranging in this manner, the following effects can be obtained.

That is, according to the stator 10 according to the present embodiment, since the gap portion 12 is provided at a position facing the weld portion 13, the air in the gap portion 12 becomes a thermal resistance, and the heat generated during welding is generated by the slot 113. The influence on the insulator 114 disposed therein is reduced. Since each through-hole H of the core sheet S ₁ constituting the gap 12 is provided with an opening 14 on one end side or the other end side of each through-hole H in the circumferential direction of the yoke 111, the opening 14 Thus, a part of the heat transfer path is blocked, and the effect of reducing the heat transferred from the welded portion 13 to the slot 113 in each core sheet S ₁ can be further enhanced.

The opening 14, since it is arranged alternately at one end or the other end of the one or more core sheets S ₁ each in the through hole H, the tip of the tongue portion, adjacent to the rotation axis direction it can be held by the other yoke portion Y of the core sheet S _1. Thereby, the tongue piece portion is supported on both sides in the circumferential direction, and the force applied to the portion where the welded portion 13 is provided can be integrally received on both sides in the circumferential direction of the gap portion 12. Therefore, it is possible to sufficiently ensure the mechanical strength of the entire portion where the welded portion 13 of the yoke 111 is provided. At the same time, since the heat transfer direction is distributed on both sides of the gap 12 in the circumferential direction, it is possible to obtain a synergistic effect that can prevent the occurrence of bias in the deterioration of magnetic characteristics due to welding.

  Furthermore, as described above, the heat transmitted from the welded portion 13 to the slot 113 can be greatly reduced, so that the dimension (thickness) in the radial direction of the yoke 111 can be designed according to the amount of magnetic flux. . Thereby, since the stator 10 can be suppressed to the minimum necessary size, the rotating electrical machine 100 can be reduced in size. Alternatively, the space of the slot 113 of the stator core 11 can be expanded to increase the space factor of the winding 115, so that the high performance of the rotating electrical machine 100 can be achieved.

  Next, an embodiment of a stator manufacturing method according to the present invention will be described. In the following description, the method for manufacturing the stator 10 according to the first embodiment described above will be described as an example. As shown in FIG. 1, the stator 10 includes an integrated stator core 11 in which a split portion is not formed on a yoke 111, and is fixed to the container P by welding. The method for manufacturing the stator 10 according to the present embodiment includes a stator core forming step and a welding step.

  In the stator core forming process, a punching process and a laminating process are performed through a process of preparing a magnetic steel sheet having a thickness of about 0.3 to 0.5 mm, the surface of which is insulated. The stator core 11 described above is formed through these steps.

First, a punching process for forming the prepared electrical steel sheet into a predetermined shape is performed. In the punching step, the core sheet S ₁ as shown in FIG. 3 is punched and formed by punching the electromagnetic steel sheet using a cutting means composed of one or a plurality of punching dies. In the present embodiment, first, an annular yoke portion Y and a plurality (six in this embodiment) of teeth portions T projecting radially from the inner periphery of the yoke portion Y are formed. At this time, the outer periphery of the yoke portion Y is generally formed so that the outside of each tooth portion T is arcuate and the outside of each slot 113 is linear. Thus, the periphery of the core sheet S ₁ is formed. Next, the core sheet S ₁ is formed by forming the through hole H and the opening 14 at a predetermined timing in the yoke portion Y at a predetermined timing.

  In the present embodiment, the through hole H having a triangular shape in plan view is formed by punching near the outer periphery of the yoke portion Y located outside the tooth portion T. Further, two through holes H are provided at positions shifted by 180 degrees in the circumferential direction of the yoke portion Y. As long as such a positional relationship is satisfied, the tooth portion T in which the through hole H is provided on the outside is arbitrary. In the present embodiment, since the six tooth portions T are provided, the tooth portions T provided with the through holes H on the outside face each other.

  Openings 14 are formed in the through holes H thus formed. The opening 14 is provided on a different side with respect to the center of the through hole H in the circumferential direction of the yoke portion Y. Specifically, as shown in FIG. 3, one (front side) through hole H has one end side of the through hole H in the circumferential direction of the yoke part Y (on the left side toward the outer periphery of the yoke part Y), The other through hole H is provided with an opening 14 on the other end side of the through hole H in the circumferential direction of the yoke part Y (on the right side toward the outer periphery of the yoke part Y). In addition, although the opening part 14 does not necessarily need to be provided in the edge part of the through-hole H, if the opening part 14 is provided in the edge part of the circumferential direction of each through-hole H like this embodiment, a welding part will be provided. This is preferable in that it is possible to ensure a wide region where the layer 13 can be formed.

Examples of the method of forming the through hole H and the opening 14 include a method of punching and forming the punching position with respect to the core sheet S ₁ at a predetermined timing using a movable cutting means. The movable cutting means is a cutting means capable of relatively moving the punching position of one or a plurality of punching dies with respect to the core sheet S ₁ by a prior operation setting or the like. According to such a method, there is an advantage that the through hole H and the opening 14 can be formed at a desired position of the yoke portion Y without requiring another process. The through hole H and the opening 14 may be formed individually at different timings, or both may be formed simultaneously.

Alternatively, it may be a through hole H and the opening 14 with the fixed cutting means punching position relative to the core sheet S ₁ is fixed to a predetermined position. If the fixed cutting means is used, steps such as positioning of the mold and selection of the mold can be omitted or simplified, and the through hole H and the opening 14 can be formed singly, so that cutting is performed. There is an advantage that the control of the means is easy. In the case of using the fixed cutting means, similarly to the case of using the movable cutting means, the through hole H and the opening 14 may be formed individually at different timings, or both may be formed simultaneously.

Next, the lamination process of laminating the core sheet S ₁ obtained by the punching step described above in the rotation axis direction is performed. In the present embodiment, the core sheet S ₁ having the same shape punched and formed by the punching process is laminated by rotating it relative to the already laminated core sheet S ₁ by a predetermined angle in the circumferential direction. A laminate L ₁ as shown in FIG. 6 is obtained. Note that the laminate L ₁ is shows a part of the stator core 11, the number of the core sheet S ₁ constituting the laminated body L ₁ is, for example, the rotation axis direction of the thickness of the rotor 2, and the rotary electric machine 100 It is determined as appropriate according to the purpose of use.

Specifically, each core sheet S ₁ is laminated in the following manner. In the following description, the circumferential position of the through hole H formed in the core sheet S ₁ to be the first layer as a reference position. The reference position is, for example, operation setting of the cutting means in stamping (more specifically, the setting of the punching position relative to the core sheet S _1), conveying means for conveying the core sheet S ₁ formed by punching up lamination process (e.g. , Conveyor, etc.).

First, each core sheet S ₁ which constitutes the region X ₁ shown in FIG. 4 (first to fourth layers) are laminated. In the present embodiment, the second layer core sheet S ₁ is laminated by rotating 180 degrees in the circumferential direction (clockwise or counterclockwise) with respect to the first layer core sheet S ₁ . Similarly, the third-layer core sheet S ₁ is the second-layer core sheet S ₁ , and the fourth-layer core sheet S ₁ is the third-layer core sheet S ₁ . Laminated by rotating 180 degrees in the circumferential direction. In other words, the core sheet S ₁ of the first layer and the third layer is 0 degrees from the reference position in the circumferential direction, the core sheet S ₁ of the second and fourth layers are rotated 180 degrees from the reference position in the circumferential direction lamination Is done.

Then, each core sheet S ₁ which constitutes the area X ₂ (fifth layer to eighth layer) shown in FIG. 4 is laminated. In the present embodiment, the fifth-layer core sheet S ₁ is laminated with the fourth-layer core sheet S ₁ rotated 60 degrees in the clockwise circumferential direction. Subsequently, the sixth-layer core sheet S ₁ is laminated with the fifth-layer core sheet S ₁ rotated 240 degrees in the clockwise circumferential direction. The seventh layer core sheet S ₁ is laminated with the sixth layer core sheet S ₁ rotated 60 degrees in the clockwise circumferential direction. The eighth layer core sheet S ₁ is laminated with the seventh layer core sheet S ₁ rotated 240 degrees in the clockwise circumferential direction. In other words, the fifth and seventh core sheets S ₁ are 60 degrees clockwise from the reference position, and the sixth and eighth core sheets S ₁ are clockwise from the reference position. Laminated by rotating 240 degrees.

Subsequently, the core sheet S ₁ that constitutes a region X ₃ shown in FIG. 4 (ninth layer to 12 layers) are laminated. In the present embodiment, the ninth-layer core sheet S ₁ is laminated with the eighth-layer core sheet S ₁ rotated 120 degrees in the clockwise circumferential direction. Subsequently, the tenth layer core sheet S ₁ is laminated with the ninth layer core sheet S ₁ rotated 300 degrees in the clockwise circumferential direction. The eleventh layer core sheet S ₁ is laminated with the tenth layer core sheet S ₁ rotated 120 degrees in the clockwise circumferential direction. The twelfth layer core sheet S ₁ is laminated with the eleventh layer core sheet S ₁ rotated 300 degrees in the clockwise circumferential direction. In other words, 120 degrees in the clockwise circumferential direction of the core sheet S ₁ of the ninth layer and 11th layer is the reference position, the core sheet S ₁ of the 10th layer and the 12th layer in the circumferential direction of clockwise from the reference position Laminated by rotating 300 degrees.

Thus, in the present embodiment, the core sheet S ₁ of the (n + 1) th layer (n is a natural number) has a slot pitch θ (360 degrees divided by the number of slots) in the circumferential direction with respect to the core sheet S ₁ of the nth layer. The film is laminated while being relatively rotated by an angle corresponding to an integral multiple of the angle. In this embodiment, since the number of slots is 6, the slot pitch θ is 60 degrees. Thus, the core sheet S ₁ of the n + 1 layer (n is a natural number) is the angle at which the core sheet S _1, is rotated relative to the circumferential direction of the n-layer, 60 × z (z is an integer) of It becomes. The reason why the core sheet S ₁ is rotated at such an angle is that the phases of the tooth portions T in the circumferential direction of the core sheet S ₁ can be laminated in the same manner.

Further, in the present embodiment, in the region constitutes a part X _n in the rotation axis direction of the laminated body L ₁ (not shown), each core sheet S ₁ is, the core sheet S ₁ which has already been stacked, are laminated by only relatively rotating respective circumferentially 180 degrees, and each core sheet S ₁ constituting the different other areas X _{n + 1} (not shown) to the region X _n may constitute a region X _n Each core sheet S ₁ is laminated with a relative phase shifted by a slot pitch θ or a slot pitch θ + 180 degrees in the circumferential direction.

By performing the above-described laminating process, the gap portion 12 in which the through hole H communicates in the rotation axis direction over the plurality of core sheets S ₁ is formed, and in this gap portion 12, the opening portion 14 is a single core. The sheets S ₁ are alternately arranged on one end side or the other end side of the through hole H. At the same time, each opening 14 disposed in each of the laminated surfaces A _{1 to} A ₆ formed on the curved surface portion of the outer periphery of the laminate L ₁ (see FIG. 6) obtained through the lamination step is shown in FIG. It is arranged so that the same positional relationship with each of the openings 14 arranged in each lamination plane a ₁ to a ₆ of the stator core 11 shown. The positional relationship of the gap 12 in the stacked body L ₁ is the same.

Incidentally, in the lamination step of the present embodiment, the core sheet S ₁ that has already been stacked, is to laminate by relatively rotating a predetermined angle in the circumferential direction, a plurality of core sheets S _each Also good. For example, by performing the laminating step described above on the two core sheets S _each, each laminated surface formed on the curved surface of the outer periphery of the laminated body obtained through the lamination process (not shown), as shown in FIG. 5 the respective lamination plane B ₁ .about.B ₆ the same embodiment shown in.

Each core sheet S ₁ a known method which constitutes the laminated body L ₁ (e.g., welded, molded resin, varnish impregnation, etc.) By integrating the stator core 11 described above is formed. Further, a winding process is performed for each slot 113 of the stator core 11 through which a winding 115 is arranged via a film-like insulator 114 having electrical insulation. Thus, the stator 10 for fixing to the container P is prepared.

Next, the welding process for fixing the stator core 11 obtained by the stator core formation process mentioned above and the container P is performed. In the welding process of this embodiment, welding is performed in advance through a welding hole W (see FIGS. 1 and 2) provided in advance at a predetermined position of the container P. Specifically, when the stator core 11 is accommodated in the container P, a welding hole W is provided in a portion facing the gap portion 12. By performing welding to the outer peripheral of the stator core 11 positioned outside of the space portion 12 by inserting the welding hole W in the welding rod (not shown), welding rods and core sheet S ₁ is partially melted, the welding Part 13 is formed. The outer periphery of the yoke 111 of the stator core 11 (specifically, a part of each of the laminated surfaces A _{1 to} A ₆ ) is fixed to the inner surface of the container P through the welded portion 13 thus formed.

  As described above, according to the method for manufacturing the stator 10 according to the present embodiment, by adopting the above-described stator core forming process and welding process, the influence of heat during welding is reduced, and the welded part 13 is provided. The stator 10 in which the mechanical strength of the yoke 111 is sufficiently secured can be manufactured. As a result, the stator 10 is fixed in a cylindrical container P such as a pipe without breaking the insulation between the stator core 11 and the winding 115 and minimizing the deterioration of the magnetic properties of the stator core 11. It becomes possible to do.

Also, as in the present embodiment, by adopting the core sheet S ₁ of the integral through-hole H is formed at a predetermined position, the divided yokes 111 can be omitted a step of integrating the annular. Thus, punching process, each core sheet S ₁ stacked in the rotation axis direction through the lamination process, a process for integrating the stator core 11 (i.e., the stator core formation step) can be greatly simplified. The integral stator core has an advantage that the magnetic resistance can be reduced because the split portion is not formed in the yoke 111 serving as a magnetic path.

Further, in the stacking process, as described above, the core sheet S ₁ having the same shape punched and formed by the punching process is rotated relative to the already stacked core sheet S ₁ by a predetermined angle in the circumferential direction. if configured to lamination, the punching process of the core sheet S ₁ can be greatly simplified. In other words, in the punching step, it is sufficient to form a core sheet S ₁ of the same shape, it is possible to omit or simplify the process, such as mold positioning and mold selection. Moreover, since the number of the metal molds to be used can be reduced, the equipment cost can be reduced.

  As mentioned above, although the stator 10 which concerns on 1st embodiment of this invention, and its manufacturing method were demonstrated, the stator which concerns on this invention can be implemented with another form.

For example, the stator core 11 described above uses a core sheet S ₂ (see FIG. 7A) or a core sheet S ₃ (see FIG. 7B) as shown in FIG. 7 instead of the core sheet S ₁ . It may be formed. The core sheets S ₂ and S ₃ are characterized in that a caulking 15 is provided at a predetermined position of the yoke portion Y in the vicinity of the through hole H.

As shown in FIG. 7A, the core sheet S ₂ is characterized in that crimps 15 are provided on both sides of the through hole H in the circumferential direction of the yoke 111 (yoke portion Y). In the core sheet S ₂ , the caulking 15 is preferably provided in the vicinity of the through hole H and near the outer periphery of the yoke portion Y. This is to reduce the influence of deterioration of the magnetic characteristics of the core sheet S ₂ caused by providing the caulking 15 and to avoid obstructing the magnetic path.

By using such a core sheet S ₂ , the strength in the vicinity of the gap portion 12 between the core sheets S ₂ laminated by alternately arranging the openings 14 on one end side or the other end side of the through holes H can be increased. Specifically, the core sheets S ₂ laminated by the caulking 15 are not easily separated from each other, and the core sheets S ₂ having different arrangements of the openings 14 in the circumferential direction are handled as a unity in strength. be able to. Further, each core sheet S ₂ can caulked at relatively low partial magnetic flux density. For this reason, the mechanical strength of the yoke 111 and the mechanical strength of the stator core itself in the portion where the welded portion 13 is provided can be increased without hindering the magnetic path through which the magnetic flux flows.

Further, as shown in FIG. 7 (b), the core sheet S ₃ is characterized in that caulking 15 are provided outside of the through hole H in the radial direction of the yoke 111 (yoke Y). In the core sheet S ₃ , the caulking 15 can be provided at an arbitrary position within the range of the tongue piece portion, but considering the deterioration of the magnetic characteristics, the position where the welded portion 13 is formed (in other words, the container P It is preferable that it is provided so as to coincide with the position facing the welding hole W provided on the surface.

By using the core sheet S ₃ , the welded portion 13 is provided in the portion where the crimp 15 is provided, and therefore, deterioration of the magnetic characteristics due to these can be minimized. Thereby, deterioration of the magnetic characteristics of the entire stator core can be effectively reduced. Further, the mechanical strength of the portion where the welded portion 13 is provided can be further increased, and the mechanical strength of the stator core itself can be increased at the same time.

Alternatively, a core sheet (not shown) in which the characteristic points of the core sheets S ₂ and S ₃ described above are combined may be used. That is, the caulking 15 may be provided on both sides of the through hole H in the circumferential direction of the yoke 111 (yoke part Y) and on the outside of the through hole H in the radial direction of the yoke 111 (yoke part Y). In this case, the above-described effects obtained by providing the caulking 15 at each position can be obtained without interfering with each other.

In the case of forming a stator core with a core sheet S _2, S ₃ described above, in the above-described stator core forming step, between the punching step and the laminating step, by providing a step of forming a caulking 15, the above-described The stator core used for the stator of the present invention can be formed by a manufacturing method similar to the manufacturing method of the stator 10.

Moreover, you may implement with a form like the stator 30 shown in FIG.8 and FIG.9 as 3rd embodiment. In the stator 30, through holes H provided in each core sheet S ₄ constituting the stator core 31 communicate with each other over all the laminated core sheets S ₄ , and the gap 12 serves as a flow of a fluid serving as a heat medium. It is used as a road.

As shown in FIG. 8, each core sheet S ₄ constituting the stator core 31 is provided with a through hole H also on the outside of the other teeth T where the core sheet S ₁ is not provided with the through hole H. ing. That is, in the core sheet S ₄ , the same number of through holes H (six in this embodiment) as the tooth portions T are provided at equal pitches (slot pitch θ) in the circumferential direction outside each tooth portion T. . Of these through-holes H, the two through-holes H arranged at positions 180 degrees apart from each other in the circumferential direction are connected to one end side or the other end side of the through-hole H in the circumferential direction of the yoke portion Y. Each opening 14 is formed. That is, the arrangement of the openings 14 in the core sheet S _{4 is} in the same positional relationship as the arrangement of the openings 14 in the core sheet S ₁ described above.

The stator core 31 may be formed by formed by punching step mentioned above a large number of core sheets S _4, laminated in the rotation axis direction by stacking step described above each core sheet S _4. On the outer periphery of the yoke 311 of the stator core 31 thus formed, laminated surfaces C _{1 to} C ₆ as shown in FIG. 9 are formed. At this time, the arrangement of the openings 14 in the laminated surfaces C _{1 to} C ₆ has the same positional relationship as the arrangement of the openings 14 in the laminated surfaces A _{1 to} A ₆ shown in FIG.

The difference between the stator 30 of the present embodiment and the stator 10 described above is as follows. In other words, in the present embodiment, the gap portion 12 is also provided in the yoke 311 in each region where the opening portion 14 is not disposed on each of the stacked surfaces C _{1 to} C ₆ . In other words, the gap portion 12 is formed in all the regions (including the regions X _{1 to} X ₃ ) in the rotation axis direction on the respective stacked surfaces C _{1 to} C ₆ . Therefore, in the present embodiment, in the yoke 311 of the stator core 31, the gap 12 penetrates from one end to the other end in the rotation axis direction.

This is because, in the laminating step, the n + 1-th core sheet S ₄ is rotated relative to the n-th core sheet S ₄ by an angle corresponding to an integral multiple of the slot pitch θ in the circumferential direction. even the in the (n + 1) layer and the n layer each core sheet S _4, since the position of each through-hole H is disposed at the same phase in the circumferential direction. Each core sheet S ₄ constituting the region X _{n + 1} is laminated with a relative phase shifted from the core sheet S ₄ constituting the region X _n by a slot pitch θ or a slot pitch θ + 180 degrees in the circumferential direction. The same applies to the case where the error occurs.

  As in the present embodiment, the rotating electrical machine in which the stator 30 is welded and fixed to the container P is employed in a so-called hermetically sealed compressor that is hermetically sealed and housed in the container P together with a compression mechanism described later. Often. The stator 30 of this embodiment is suitable for a rotary electric machine used for a refrigerant rotary compressor used in an air conditioner, for example. The refrigerant rotary compressor is a kind of volumetric compressor, and includes a compression mechanism having a cylinder and a piston disposed in the cylinder. The compression mechanism sucks the refrigerant supplied from the accumulator into the cylinder by operating the piston, and compresses the sucked refrigerant. A rotating electrical machine is used as a power source for operating this piston (a configuration corresponding to a piston when the compression mechanism is in another form).

  According to the stator 30 of the present embodiment, the heat generation of the stator 30 can be effectively suppressed by using the gap portion 12 as a fluid (refrigerant) flow path serving as a heat medium. As a result, the capacity of the rotating electrical machine can be increased, and the performance of the compressor can be improved.

In the present embodiment, the portion where the opening 14 is disposed on the outer periphery (respective laminated surfaces C _{1 to} C ₆ ) of the yoke 311 does not necessarily need to be only the portion where the welded portion 13 is formed. For example, over the entire region (including regions X _{1 to} X ₃ ) in the rotation axis direction on each of the laminated surfaces C _{1 to} C ₆ shown in FIG. You may arrange | position alternately at the one end side or other end side of H. In this case, in the core sheet S ₄ , the through holes H provided with the openings 14 on one end side and the through holes H provided with the openings 14 on the other end side are alternately arranged in the circumferential direction. And then laminating while rotating or swinging the slot pitch θ in the circumferential direction (clockwise or counterclockwise).

  Further, the stator cores 11 to 31 constituting the stators 10 to 30 of each of the above-described embodiments are all integrated stator cores, but a so-called divided stator core may be adopted as the stator core constituting the stator of the present invention. . For example, the stator 40 shown in FIG. 10 as the fourth embodiment includes a plurality of yokes 411 (in this embodiment, a plurality of divided portions 414 formed radially from the inner periphery of the yoke 411 between adjacent teeth 412. The split stator core 41 is divided into 6) split cores 41D. The split stator core has the advantage of good core removal and high yield during manufacture.

Split core 41D is formed by laminating a predetermined stacking order by combining the core sheet S ₅ to S ₇ shown in FIG. 11 as appropriate. In the present embodiment, the through-hole H is provided on the yoke portion Y is located outward in the radial direction of the teeth T of each core sheet S ₅ to S _7. Therefore, each divided core 41 </ b> D is provided with the gap portion 12 in the yoke 411 located on the outer side in the radial direction of the teeth 412. In the present embodiment, the gap portion 12 penetrates from one end to the other end in the rotation axis direction of the yoke 411 of the split core 41D, but the gap portion 12 is formed only in a region constituting a part in the rotation axis direction. It may be provided. In this case, it may be used a core sheet (not shown) that each core sheet S ₅ to S ₇ and the planar shape is not a through hole H is formed the same.

In addition, the split core 41D is appropriately selected from the forms shown in FIG. 12 as the form of the laminated surface D formed on the curved surface portion on the outer periphery of the yoke 411, for example, depending on the size and application of the rotating electrical machine. Can be designed. That is, as the laminated surface D _a shown in FIG. 12 (a), the whole area in the rotation axis direction, the opening 14, for each one of the core sheet, one end of the through hole H in the circumferential direction of the yoke portion Y it may be arranged alternately on the side or the other side, as the laminated surface D _b shown in FIG. 12 (b), which may be a core sheet by sheet plurality of (two). Alternatively, as the laminated surface D _c shown in FIG. 12 (c), it may include a region in which the opening 14 is not disposed. The arrangement of the areas where the openings 14 are not arranged in the rotation axis direction of the lamination surface D _c is adjusted by the selection of the core sheets to be laminated and the lamination order.

The stator core 41 constituting the stator 40 of the present embodiment can be manufactured as follows using the manufacturing method described above. That is, the core sheets S _{5 to} S ₇ shown in FIG. 11 are formed by a punching process. Specifically, a T-shaped peripheral portion including a tooth portion T and a yoke portion Y having divided portions 414 formed at both ends in the circumferential direction is formed, and a through hole H is formed at a predetermined position of the yoke portion Y. core sheet S ₇ is formed by. Then, the core sheet S _7, by forming an opening 14 at one end or the other end side of the through-hole H in the circumferential direction of the yoke portion Y, the core sheet S _5, S ₆ are formed.

Here, examples of the method of forming the opening 14 include a method of punching and forming the punching position with respect to the core sheet S ₇ at a predetermined timing using a movable cutting means. According to this method, there is an advantage that the three types of core sheets S ₅ to S ₇ without requiring other steps can be formed in a desired order. Alternatively, at a predetermined timing by using the fixed cutting means, (unless However, providing a caulking) core and punching at a fixed punching position relative to the sheet S _7, it may also be flip them alternately. According to this method, since one core sheet can be used as substantially two types of core sheets using the symmetry between the core sheet S ₅ and the core sheet S ₆ , the control of the cutting means is simplified. There is an advantage that can be made.

Next, a laminated body L ₂ as shown in FIG. 13 is obtained by laminating the core sheets S _{5 to} S ₇ in a desired order by the laminating step. The stacking order of the core sheets S _{5 to} S ₇ is determined according to the form of the stacked surface D formed on the outer periphery of the yoke 411 of the stacked body L ₂ (that is, the arrangement of the openings 14 on the stacked surface D). (See FIG. 12). The divided cores 41 are formed by integrating the core sheets S _{5 to} S ₇ constituting the laminate L ₂ by, for example, welding, varnish impregnation, or the like.

  The plurality of divided cores 41D thus formed are arranged in a circumferential shape with the divided portions 414 provided at both ends in the circumferential direction of the yoke 411 facing each other, and these are arranged in a well-known joining method (for example, caulking). The stator core 41 can be manufactured by joining and integrating them by welding. If the split-type stator core 41 is employed as in the stator 40 of the present embodiment, the same effects as those of the stators 10 to 30 according to the above-described embodiments can be obtained, and the product yield can be improved. it can.

  It should be noted that the present invention can be implemented in a mode in which various improvements, modifications, or variations are added based on the knowledge of those skilled in the art without departing from the spirit of the present invention. Moreover, you may implement with the form which substituted any invention specific matter to the other technique within the range which the same effect | action or effect produces.

For example, in the present invention, the positions where the through holes H are provided in the core sheet need not necessarily be close to the outer periphery of the yoke part Y positioned outside the teeth part T, as in each of the core sheets S _{1 to} S ₇ described above. Absent. Specifically, as a modification of the above-described core sheet S ₁ , a through hole H may be provided near the outer periphery of the yoke portion Y located outside the slot 113, as in a core sheet S ₈ shown in FIG. Good. In this case, the outer periphery of the yoke portion Y located outside the slot 113 is a circular arc portion in plan view, and the through hole H is formed in an arc shape or a rectangular shape having a predetermined width in the radial direction along the outer periphery of the yoke portion Y. Preferably formed. Thereby, a fixed magnetic path width can be secured in the yoke portion Y without the through-hole H significantly hindering the flow of magnetic flux.

Further, like the core sheet S ₉ shown in FIG. 15, the number of the tooth portions T may be an odd number (9 in the present embodiment). In the present embodiment, three through holes H are formed at an equal pitch in the circumferential direction (in other words, at positions shifted by 120 degrees in the circumferential direction with respect to the through holes H adjacent in the circumferential direction). Moreover, all the openings 14 provided in each through hole H are provided on the same side of either one of the through holes H or the other end.

As a method for forming the core sheet S stator core composed of _9, for example, by a movable cutting means described above, the punching position relative to the through-hole H of the mold for forming the opening 14, one or each of the plurality varied alternately include a method of stacking a large number is punched core sheets S ₉ in sequence. Alternatively, the same shape of the core sheet S ₉ formed with the fixed cutting means described above, may be stacked while upside down alternately every one or a plurality.

The stator core is formed by, for example, the above-described core sheets S ₁ and S ₄ , in which the opening 14 provided in each through hole H is either one end side or the other end side of the through hole H. It can also be employed when provided on the same side. That is, even if the number of the teeth portions T provided on the core sheet is an even number, the stator core forming method can be employed.

Even when such core sheets S ₈ , S _9, etc. are used, the same effects as those of the stators 10 to 40 of the respective embodiments described above can be obtained, and at the same time, the problems in the present invention can be solved. Is possible. Moreover, it can also implement in the form which combined the feature point of each embodiment suitably.

  Further, in the present invention, the planar shape of the through hole H provided in the core sheet may be a form as shown in FIG. For example, like the through-hole H1 shown to Fig.16 (a), each edge | side may be formed in the substantially triangular shape curved in circular arc shape on the outer side of radial direction. In this case, the radius of curvature of the side curved in an arc shape is set so as not to contact the tip of the tongue piece. In other words, there is no particular limitation as long as it does not contact the tip of the tongue piece. Thereby, while maintaining the function as a thermal resistance, while ensuring a wider magnetic path width, it is possible to form a magnetic path along the flow of magnetic flux.

  Alternatively, as in a through hole H2 shown in FIG. 16B, the shape has a notch 16 extending in the circumferential direction of the yoke Y on the side opposite to the side where the circumferential opening 14 is provided. May be. The cutout portion 16 may have a minute width that does not affect the magnetic path. Thereby, thermal resistance becomes long and heat transfer can be further reduced. In this case, since the tongue piece is elongated in the circumferential direction, the mechanical strength of the tongue piece supported in a cantilever manner is reduced when considered as a single core sheet. However, in the present invention, as described above, the tip end portion of the tongue piece portion is sandwiched between the yoke portions Y of other core sheets adjacent in the rotation axis direction, so that it is sufficient as a laminate of a plurality of core sheets. Mechanical strength is ensured.

  In addition, although the stator which concerns on each embodiment of this invention mentioned above has illustrated and demonstrated the concentrated winding stator by which the coil | winding of one phase is wound around one teeth, the stator which concerns on this invention is demonstrated. May be a distributed winding stator in which windings of a plurality of phases are arranged in one slot.

1: Rotating shaft 2: Rotor 10, 20, 30, 40: Stator 11, 21, 31, 41: Stator core 12: Gap portion 13: Welded portion 14: Opening portion 15: Caulking 16: Notch portion 100: Rotating electric machine 111 , 311, 411: yoke 112a~112f, 312a~312f, 412: teeth 113,413: slot 414: dividing section S ₁ to S _9: core sheet Y: yoke portion T: tooth portion P: container

Claims (7)

A stator for a rotating electrical machine housed in a cylindrical container,
A plurality of core sheets formed of electromagnetic steel sheets in a predetermined shape and laminated in the direction of the rotation axis, and a stator core having an annular yoke;
A gap formed between an inner periphery and an outer periphery of the yoke, and a through hole provided in a portion of the core sheet constituting the yoke communicates with the core sheet over the plurality of core sheets;
Provided on the outer periphery of the yoke located outside the gap, and a welded portion for fixing the container and the stator core,
In the gap portion facing the welded portion, an opening is provided on one end side or the other end side of the through hole in the circumferential direction of the yoke,
The stator, wherein the openings are alternately arranged on one end side or the other end side of the through hole for each of the one or more core sheets.   The stator according to claim 1, wherein the core sheet includes crimps on both sides of the through hole in the circumferential direction of the yoke.   3. The stator according to claim 1, wherein the core sheet includes a crimp on the outside of the through hole in a radial direction of the yoke. The through hole communicates with all the core sheets stacked,
The stator according to any one of claims 1 to 3, wherein the gap is used as a flow path of a fluid serving as a heat medium. A method for manufacturing a stator of a rotating electrical machine housed in a cylindrical container,
Preparing a magnetic steel sheet;
The magnetic steel sheet is punched to form a peripheral portion of the core sheet including a yoke portion having an arcuate outer periphery in a predetermined shape, and a through hole is formed between the outer periphery and the inner periphery of the yoke portion. A core sheet punching step for forming an opening on one end side or the other end side of the through hole in the circumferential direction of the yoke portion;
The core sheets obtained by the punching step are stacked in the direction of the rotation axis, and the through hole forms a void portion communicating with the plurality of core sheets in the rotation axis direction. For each one or a plurality of the core sheets, alternately disposed on one end side or the other end side of the through hole in the circumferential direction of the yoke portion,
A stator core forming step having:
A welding step of welding the outer periphery of the stator core located outside the gap to fix the stator core obtained by the stator core formation step and the container;
A method for manufacturing a stator, comprising: In the punching process,
A plurality of the through holes are formed in one core sheet, and the opening is formed on one end side of the through hole in the circumferential direction of the yoke portion, and the other through hole is formed in one through hole. The method for manufacturing a stator according to claim 5, wherein the opening is formed on the other end side of the through hole in the circumferential direction of the yoke portion. In the lamination step,
The core sheet having the same shape punched and formed by the punching process is laminated by rotating it relative to the already laminated core sheet by a predetermined angle in the circumferential direction. Stator manufacturing method.

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